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The core infrastructure has everything in place to switch MBIGEN to per device MSI domains and avoid the convoluted construct of the existing platform-MSI layering violation. The new infrastructure provides a wired interrupt specific interface in the MSI core which converts the 'hardware interrupt number + trigger type' allocation which is required for wired interrupts in the regular irqdomain code to a normal MSI allocation. The hardware interrupt number and the trigger type are stored in the MSI descriptor device cookie by the core code so the MBIGEN specific code can retrieve them. The new per device domain is only instantiated when the irqdomain which is associated to the MBIGEN device provides MSI parent functionality. Up to that point it invokes the existing code. Once the parent is converted the code for the current platform-MSI mechanism is removed. The new domain shares the interrupt chip callbacks and the translation function. The only new functionality aside of filling out the msi_domain_template is a domain specific set_desc() callback, which will go away once all platform-MSI code has been converted. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de> Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20240623142235.146579575@linutronix.de
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.